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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d08ca24a549bc9f6ed33ef1a6796362a39477cf0431f9c7bff5ef7cfbb962c' 
  AND token = 'ej+Yq9TxRgIyowXJ2udP551Au7zi/60lDyZk0G7Pgd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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