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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee11561d3616f0b2f16b0c069b64130cb49ead4efdf774476d4ad86e81219c4' 
  AND token = 'UBxyaWAGShGEy9lukJ76dbanMD0F1rXHh7onmhWI84U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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