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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f202433c037c9fdd4772120b09def83cb1f82117fe7cc2ce4d5b25ffc1ed9ea' 
  AND token = '+6n+Z+lSob9VCm2sZj3xwSqi5orNwc++Jc1B9ulB9w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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