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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852995c590ae26e1f5367782fcf51753fc52e26e057d73d417769774d6d1684a' 
  AND token = 'E6gSq7ZubtG/cUTeLgMK3Nr6dVaDCi/OcqAf+RbJTnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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