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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06ee6e8ca594ceb687f4bffbee54460fad63e4813c95f200503ffe9ac6be863' 
  AND token = 'T9t4JXfIMI/PoyQ/xJPgCng9r+CTdi4Tw4Gt6vdC0uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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