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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0b4dced78fbe6e500f78845f67a769f3596725ded094c91abd35cd4a6878d2e' 
  AND token = 'B1T/TWejORcQB5zDCG05P9Ee/pKPLQj4+cWQT8sTsm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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