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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ab13d5d50188fe3527d3d4b958f7441fbaf5efde9ce779fb375cfbc50496ee' 
  AND token = 'D1AIbomAvMqYS1RB62comPujkTHjBtvoHokpR1f1kbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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