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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e3f01a5c143962f4cdbc320f33be75c5d4a6c3e2ac5a742ed0cae9a5ac8566' 
  AND token = '1+J7foMUqawSYPvOpBAcpEJ0w40/u1sfJVi67oEgCJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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