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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d337064820f9af53c41d2e5f150f5821bc8d2052bc153b9a2cdf2e4dc76a573' 
  AND token = 'OI8ilAz6y08kwFVOUsqJ7nB88Jg86dR1zP+DjqWj1zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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