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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6b26d4bfc14b1905140d1573216a145751e06341f5474a3b1d6d87f918c42cb' 
  AND token = 'VY2cImZUdEexoo5qCyY8Zwo5UWwgwSwYvyTN++AV3nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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