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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4caafd7d673552343265892832c8fd8dfce8a97ff46d5cb134e97aa59d1e27' 
  AND token = 'iKwui4Pzgga5RUU3fRdMT4ijkqTN0Thjd3rBJbOq5Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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