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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1282384100f3f4f395fbe0f6644c2e06dc27bb0b5bb04a5d32ac0f86c0d2754e' 
  AND token = 'e0jboyShCmKFZFkwlnl13rZDyWtmdLXi5AfnyexaMw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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