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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63de18511bb5497e5bbb05c60abf781d9389a54376f594f7a53988e2854689c8' 
  AND token = '32r1knzt1AUDbfu+Vw6GHt/2164VszQX/KxefudDw6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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