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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5238bcd3b9ec2edc4996a649f1382b140ccbe996f37fec9e8d47a3c503db1c92' 
  AND token = '2LpB1Z/ZXtVWMmjl0uZ6Zrq8MKxZ0/Nh/7bkFv9z6ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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