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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8809f5398a70d557470df66d0c819067cfa1d575d5e115293662b20fcb82aca5' 
  AND token = '+mXnnVyD/d1c04NAtgAnfJhlc5LhuXpbYsop9DmfCZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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