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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a29057a29f20b1f4a73868d44a31b1cf10e9b4a0586294a2478becd76d9b0ad' 
  AND token = 'zhaSN0YMsY0E8tblwItyUR9berxp+ZVj/Fcu7nTF3l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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