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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d24c853df44c695b344231c8c937d94ac8bcb4c350af6356a2c1f0fffd85b25' 
  AND token = 'mmFW01Kllmc70EbFgqyxainACYu903Ub4qHWdT3uKrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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