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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd9730814e437d1ac36a420a121abbcf7a770e886d1fd206d9fef11ad759d2d' 
  AND token = 'dAI2XEW/Zc2nglBLz0N7DoIFPuMtp+Ed56G/8YcxTtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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