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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89a99bff716d6d85a8905d6449d2b2311b5261dabfa79f68186ef43152194d8' 
  AND token = 'fdoj5VF7K3WdDpjEX0F/ElTCKIdzuklF+tVf2nUB1Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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