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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038f29566141cf4fdf3609e81652e3637be0ca4d912640f28b28e1d3ffc06869' 
  AND token = 'ckrsmvaDBwb9J2pAMoghi0vhWJyCZMpw+TPvEwvS/1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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