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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203bf84f4c122954d52edf302100084bac08c8ec634cd5e78a5f20622d5b1d4f' 
  AND token = '0ZkTL+Fc1QWd/BHReaEVRG6tSXnPJENAQFEOdiHuW28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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