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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b961075b46e84d5c2dbdc58eebd5d92d0582e8e189fa3a2e88d50bd9f3ae3bd7' 
  AND token = 'SWXFKjAIQA0gjIMy/HPk/Eh9WtIcwyQMXmuAA1MYKZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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