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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f31ec3321ac0bb236e92235cec9da017f6cb471c3f64e4978123e279a8e3d6' 
  AND token = 'r9rCAOq8j9gfZRvb9PfbIC6WsfWqL03i0JEP77oTd+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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