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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7d94c5b475744c9f25ae52afd4f3707d539ac428fa7533aa91dbda765f66b9' 
  AND token = 'gKlURA1K5/dsjYXC43NIECugSxjadC7Gj4XfsU0KV8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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