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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb8e0eda1ddfa8ca078a163ff6d6cce5579e15f0dc70ff8478151beb62e29e6' 
  AND token = 'PAChx9z26hZng3969BDodS5cbiwJ1pVDUEYsucSoxNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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