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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e1e86601b129fcbe7cbb826cb9a2acf0165edfb00af5201622e1f961bba783' 
  AND token = 'U7Jd7Mj1wcja7Jy8wA89Qi7hwfsz43M4Ue5ZEfVH+ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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