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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d9ff974095c2f4b06081e78d17b87cd5274206ae15fd7c9e91a330b1ad6923' 
  AND token = 'IdwdfLN8eYIR8zF945dkYXP/h0cY2bVePJKJ7P57diM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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