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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40f4428be8e9debffbc3b2529dd87bd249d925eb280754494e2973a8a4a58b0' 
  AND token = 'ib7fsPX1yIjP209knYP+Dwly6iW81eOpXHX7IbM9PzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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