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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '858f8f549e7c15b7011d16d2d24dc4579c31362b9f4321a6fac5e92363fcff3c' 
  AND token = '36ULR4SMtTyBrcADBb9NgfbcljTVMrIbv5tjBhZvHB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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