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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0e6f0df48114bf914aeb6204e5a611bbfd64866fed86cefe2ca2325b100802' 
  AND token = 'bKmfWU739knls20Q2jLkQo7bvw5l8lCFW9TI9Sas7Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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