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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac34508c3bc46cda782b146cf910241798e6ca1186ef23369987b871f76152c' 
  AND token = '+FkGMBbUf16em8oSftN03Ei3Gk3q39d+j30XQzygUIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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