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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3af2ec9d496073b3c4f812624eec38e6155efea6f858d0df6b8e73774677692' 
  AND token = '51c6ojBLE3iLPGN8XdP6KbQF492si94Vuk5aKWJyNYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}