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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a18992aaf3b5d73a953009934e798be1753323f41f62e57b2e5cbe8a602be98' 
  AND token = '2+KZbQp7VcDPcXiedOnvuBlisxFISSIzM3W1qvTJCo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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