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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7fbe717c7e4d7fe40e6eac03bc12dbc99dcc7e933e8d6910c7fd7f995216b4' 
  AND token = 'FqLDAHUOpnlkqNCjLFyHUwT3AsOqH9selhNmEHzHN5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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