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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09db559af1de3565a3290e6c130c1b48a112a550067e176d4f5966d74e1dcf6f' 
  AND token = '0p6fYBxQ2z6+5djAgufSCNbVuBcQ77SCWcBJLIkzt50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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