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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4670a282427ce5afdc99b55a499d1e71616e0bf35f816b2fd44d278e96d5b5f3' 
  AND token = '1IhsVX/fPSjWf86BMK056iHusLCSFPkChOjc6QV4WjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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