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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9a88b3e3e6cd27c5c06d8653c4f714e5513b37a5de586fbb69d192dd40bd84' 
  AND token = '3Y22mJELd/mUxyzyP4ppefVkjoJLh1gdtWQMlLlRGc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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