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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc5ce1ed60469bead65fd46be92df656fa5f72b384eb0c17b7831666fcfe3df' 
  AND token = 'p1B0sniKf+ltHvfMxYsRAV2mSqfvVkp4HQimvy0jW38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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