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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0036e8be5eb372254fb5318acf1c73e357ec1702976a249080bd4e50cc25c276' 
  AND token = 'YUH67h7u0FRU51IzIQQYBjx4q9U1hq0Ks7rv2WCpup4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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