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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '351f0987ebf8b03c95f7e873113c84be3f037ff43c6a858596001667b915ce73' 
  AND token = '5IIdzCh++3GdBNSYCLGhk66bQCF2YyLd6l668cGU/E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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