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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d31e3f12965b24db91f205c79502d74f2b0a8369c2547071bebd5d2b0cda832' 
  AND token = 'pEFhI8IW2CBdARZi3b2OV7r+y0f67b63R1Ey6m8tucA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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