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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '755b45bb7b5b9a27e3905a2967abe6eb2d2941163d2faa4d4d2690919bf5abb7' 
  AND token = 'uJ5kZ2SpX82vFpG2U+3Rg8b/BkXodmDhFGJ6yy1iGh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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