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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de6dac9e118a222d7e6284274862b68794afb02ec1833db207afc700cacc2ee' 
  AND token = '1r42k44p3KKmYP+IYPbxMJt7uJCNlkU73S6b7AZFks4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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