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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c5deb44958c2681a652627e5f38b097c0f5e93c389376d854e1ec92ea81679' 
  AND token = '3CixIqIylAhSXJIz8t0SWgaTmG94QxccJLGs9OGp62g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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