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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1edb307ea3c336e36d949c8007fc19c8e22de73d7989d5cb37025680ceadd664' 
  AND token = '1BxapVXkK/ho9jpMAXLUakKKYuDlI1/MruhkPq3Yeg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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