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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '381bd679122cdcfa56f8ed39af5ad2c4d03cd53101748a35745b6dfb9924390b' 
  AND token = '7d8QUAllD3n2JHMy4R4S67riVMaY/cuAsxmxVMpembs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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