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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '228c39ac0c2d7aa94316a9c2e6316c8412ad1232bd0b2b978fe9e96383b594d1' 
  AND token = 'zr7GmS5Eg4mA48m7yXFKz2y+TsuQX38DfqgP+/sKCGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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