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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7479d477ea0c5ae9b4efa500e16e1263f50f7a9847a9c1de20482d30fa0b6ada' 
  AND token = '0Z3MAxahlwFTZQyJLcfxlgoXNT4HCP3hZS7+NawHp+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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