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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56942872f07bd9776ab8e4c07af14f0550d37b42e3e6b569aaff65214f1d2f67' 
  AND token = 'v6Ln/HLHr/+tj1Y9GTJVEHQZokcG1idrtzId4Mn77xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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