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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1233ac278fc93d59c43de2b728450b69c506418b50c6176cde8d82f8188248f6' 
  AND token = 'FBOJPLQb8JnPJeXkTOHpw3K03M5HnrhjDSVD0kVHL9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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