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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca2ab2b6ff5fd2de6a89379a06d5e7064dca0ae6814568bb2c26f61c219f82f5' 
  AND token = 'qyxunrWNDrmJFVkzcQFweMx6VC5RSQV9e13LVeu8eaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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