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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd48dbaf8e5afcd184e3b1f22b4914eec2b0abefd4c9539983bcdfc5c4988d1c' 
  AND token = 'b04Oly4h5LYhKD89XKDS4nsP1fl2RAULo2k5ad2dVaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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