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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c8eff8aaf8df4a7c90e6d66f4a1109938f5ac46d1cd9b541d1345a9d6a3cb1d' 
  AND token = 'fMSZ9J5B+kY72EXA97J/7u3VpQlOFsk8gQBnw8xAfXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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