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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8af9b97016161d8cdd0fc9654da3ddca99d7a91e89a90b0744149a1cd0c9f8e' 
  AND token = 'NnA2gjoUHgqSyZg8yWNr9BM9XiVFlG9DmWYtbvpU7Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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