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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '114398a3d515d529fd59840478689ad3fdc954289c25319255ca1e50640fe900' 
  AND token = 'QqTlpuF4LFulqOIIWE4PsTqq7rbV9ki36IyoOe1+/jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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