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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32aa1276c10ed529e2b09a7b53c66b6043d08b1168e4e8560929e1722f74fe96' 
  AND token = 'B/c0jtIOH3qe2JakQE9X7srCaKmrgP/saSmNKVylKA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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