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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4142f0153913c0aa2db77389ec6e00d2f2d798e8fef50f7b6e7317c441f0ce66' 
  AND token = '3sjy8ZJ0KsCDJksiHZJS0X6dAevnM2yx6Q3hoAfA3E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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