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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d48b2b4bc0c6f73e8b9a6ebbaa79f2925e6ca7a0d0371c00058a20a97fe2ae' 
  AND token = 'm0YenXAqWVI+UPkY5nhxt57cOsC6wZKOHvjB4cbsKG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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