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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5402f17cf0963f98b11ab89a6828a82007e65b900afb151fcf6bfa03852c68b' 
  AND token = 'DH1icRr1byb4nXX5Yq9q/zIifaDXKGCg44FLqv7x/QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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