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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad03b3b49a7ef5f4e8f07172a89e12fa0ec082bf63bbedc9f6ba5ad8c6df4627' 
  AND token = 'iy73UX2yMiY3l/wykt15JymhN1OAywGThuOCX8KZkE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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