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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3767c87ebeb0c69cebd8c1917bd740c0bbbb6d66c7d968b45e893cb94ebf9c9' 
  AND token = 'BbUzvfXGU4lcOBb7cjTBk8B9G4aTzTDXgpsuN+0TqcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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