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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2f2e5154532ad4c6877c557c960d25a79c4e54d1069b464a594664c42d2bfb' 
  AND token = 'fq9ahmZVT1fDdYBiQbHPHqt8Wne4JLWJT45AK2ff6rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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