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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9899f2c2d636763ddfb5a367bd3407a97568cbaa7d794d73c2404b3ed39c6eeb' 
  AND token = 'zE3Rup8quh/S8F1xqDI0NtsD7eZFVv8GSmJxpxrGN4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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