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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd68cd07e2c0e9a2c22bc7a30627a8e91dcc827159200a85ef1b7e70c79ee3ea' 
  AND token = '1vx7Udw/BBr4c7WU7Qag5vB9pWhJNfeeetAFOMEc6qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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