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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3885c72dd16c5e42bc8545c68ba8f5fb8edd90fb1f1d477d4758d293973ef35a' 
  AND token = 'dhJCKysn1O60iSPtB4hg8Wg4hyiK1c1NxFU5rZ38VDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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