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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e4f56aeeacfd2a5992a83c3ce158dda2e469b6120bf328a96a40017f4aa3df' 
  AND token = 'YOjvXF06qVvf7r6O6vYOXDm5RXyyg81sLMQN4NNrsLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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