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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ac6a6a628b9e912a696764e7607001b4159beaa1e7486da19fc60781e3f939' 
  AND token = 'Gz5+ch6kJ8S5wk9seSYm6ZTPC/t7jULA0FoWRiSbM3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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